Energy has already proved to be a highly contentious issue in Colorado’s U.S. Senate race, and the hyperbole is expected to reach warp speed if the U.S. Senate votes this week on whether to fast track the Keystone XL pipeline.

The pipeline project — which would route oil from Canada to Gulf Coast refineries — has become one of the key partisan battles of the race, as evidenced by a tweet Monday from the Colorado Republican Party. It maintains that Democratic Sen. Mark Udall opposes the Keystone amendment to “appease billionaire donor Tom Steyer,” an environmentalist.

Udall said he has been consistent with his vote.

“I’ve voted against all these amendments — to restrict the pipeline, to build it, to determine where the oil goes or doesn’t go,” he told The Denver Post on Monday.

Congressman Cory Gardner, a Republican who unexpectedly jumped into the race in February, backs the project and has hammered Udall on his position.

“Senator Udall’s refusal to support the creation of tens of thousands of jobs is exactly why Coloradans are calling for new leadership in the U.S. Senate,” Gardner earlier said.

The Keystone project doesn’t run through Colorado, and currently is stalled in the courts in Nebraska, Udall pointed out, saying that’s why he’s concentrating his energy efforts on Colorado.

“It’s where a leader would have his focus, on what Colorado can do for the nation’s energy security,” Udall said.

Several news outlets are reporting that it appears the Senate is short of having enough votes to pass the amendment. But having the vote would allow Democratic senators in tough races to vote “yes” on the amendment, which calls for an override of the State Department review that Udall supports. That review is not expected until after the midterm election in November, which polls show will be favorable to Republicans.

“Building the pipeline could have serious implications for our nation’s water, land and air,” Udall said. “That’s why it’s important to finish this technical review.”

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